DE2354974A1 - Plastics carrier bag stacker - operates continuously one on another before moving under folder and away in stack - Google Patents

Abstract

Thermoplastics foil carrier bags are stacked continuously one on another, and the stack is moved beneath a folder and the folded stack is transported away. Pref. the stacker consists of a support for the stacked bags, cooperating with a clamp unit which grips the bags or stacks in the region of the long edge, for relative displacement between the support and clamp unit by spring elements while a holder acts on the bags. The support table is resiliently mounted and at both long edges of its stops engage over to a small extent. The stack is clamped between the table and the stops. Bags or sacks with different cross weld or side weld seams can be stacked.

Description

Lh 511

Patent application

of
Mr. Hans Lehmacher, 5216 Niederkassel-Mondorf, P.O. Box

Method and device for stacking and depositing bags

The invention relates to a method and a device for stacking and depositing bags, in particular carrier bags made of thermoplastic plastic film.

For stacking bags, a device has already been proposed with the features that the lower welding jaw a has protruding edge extending in the direction of movement of the casing, on which a carrier is in contact from below in such a way comes that as a result, one end of the bags is gripped like a clamp after the cutting process, and that also the carrier a Has support surface for the stacked bags, via which it interacts with a holder behind the upper welding jaw is arranged and moves parallel to this welding jaw.

With this known device, only bags with a bottom seam weld can be stacked in such a way that the bags in the area the cutting edge of the transverse weld can be detected by the clamping device. Leave with this known device not bags with one side seam with two across the

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Weld seams running at a short distance from one another Get a separating cut, stack, because by clamping the bags when stacking, the not yet cooled weld seams can lead to undesired adhesion of the weld seams during stacking. In the same way you can do not use the known device for stacking bags with a transverse seam welded by a heated wedge takes place, since in such a case there is also the risk that the weld seams that have not cooled down when the bags are stacked lead to undesirable caking. The known device shows no measures for removing the stacked Bag, so that this is done by hand.

The present invention is based on the object of stacking bags or sacks with different transverse weld seams so that the transverse weld seams can also be side welds, i.e. between two transverse weld seams that are close to each other a 'separating cut is made, or the transverse welding takes place in conjunction with a welding wedge that at the same time gives the separating cut. At the same time, the task is based on the bags immediately following the stacking to be folded, punched if necessary and then placed on another conveyor belt.

To solve this problem, in a method for stacking and depositing bags, in particular as carrying bags thermoplastic plastic film, proposed according to the invention,

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that the bags are continuously stacked on top of each other, then the bag stack is moved under a folding device and the folded Bag stacks are transported away by a transport device.

The solution according to the invention does it. possible stacking, folding as well as the removal of the bags by machine in quick work sequences to be done '.

In a further embodiment according to the invention, as Apparatus for performing the claimed method proposed that the stacking device consists of a support for the stacked bags, which cooperates with a clamping device that holds the bags or the Stacks of bags detected in the area of the longitudinal edges for relative displacement spring elements are arranged between the support table and clamping device and continue to Bag acts a hold-down. As a result of the measure that the bags are stacked in the area of their side edges to capture will be the rear transverse Areas of the bags are not pressed against one another, so that in such areas possibly existing, not yet or Insufficiently cooled weld seams have no effect on the stack. Since the weld seams for stacking have no influence they can have a wide variety of forms of training. Due to the stacking according to the invention, it is in particular possible to process thick-walled film, the welding of which

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- 4 seams need a much longer time to cool down.

In a further embodiment according to the invention, a support table is resiliently mounted and has both longitudinal edges the Auflagetisehes these do a small degree overarching Stops on so that the bag stack is clamped between the support table and the stops. Is particularly advantageous the support table can be tilted around a horizontal axis against the pressure of peder elements.

In a further modification according to the invention, it is also possible for the support table and the stop bars to be arranged in a stationary manner can be pressed against the stack of bags by the pressure of spring elements and can be raised against the pressure of spring elements are.

In a further embodiment according to the invention, it is proposed that the bags to be stacked in the direction of movement in front of the hold-down a stripper moving parallel to this is arranged, which has the task of welding the Bag existing area from the welding device or, if it is a separation welding device or only Separating device acts to pull out of this.

The solution that a tape take-off is arranged immediately adjacent to the support table is particularly advantageous

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and when the bags are stacked, the bags with their in the direction of movement the front part on the tape take-off and the rear part on the stacking table. Thus the edition for the bags to be stacked or stacked, divided into a first area, which is also a transport device and a further area that is the clamping device.

In connection with the stipulations to firmly arrange the support table and stop bars as a clamping device relative to the stationary one To move the support table, the support table itself can also be the trigger device ', so that in such a In the case of the term "support table" can also be referred to as support can.

As part of the proposal, the support when stacking is also used as a transport device for the further transport of the stacked items To use bags, the transport device can also counter the pressure with stationary stop bars can be lowered by peder elements and under the pressure of the spring elements be liftable. The basic proposal according to the invention allows many modifications in this respect.

In a further embodiment according to the invention, two are spaced apart one behind the other for transporting and folding the stack of bags arranged tape take-offs are provided, with the first tape take-off in the transport direction having a constant

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has running sense, the tape take-off behind it on a return is convertible and in the area between the two tape haul-offs a folding sword that can be moved between them is arranged is.

In a further embodiment of this solution according to the invention it is provided that the first tape take-off and the downstream second tape take-off in their adjacent area parallel or substantially parallel and vertically directed Have funding directions. Furthermore, it is proposed according to the invention that the first tape take-off such a guide has that it transfers the folded stacks of bags onto another conveyor belt.

The solution according to the invention makes it possible to have a punch act on the stack of bags, for example to punch out handle holes or to make essentially rectangular punch-outs, to make bags with two handle loops obtain, which are known as "shirt bags". For this purpose there is one in the area above the second tape take-off Punch acting on the stack of bags is present, in a further embodiment according to the invention in an area below the punch and within the movement-adjustable tape take-off a transverse to this conveyor belt for the punched-out parts of the bag stack is arranged.

The invention is explained in more detail in the drawings using a few exemplary embodiments. It is not limited to that

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Shown forms of embodiment, rather, further modifications within the scope of the invention are possible. It demonstrate:

Pig. 1 shows the device according to the invention in a side view; FIG. 2 shows the device according to the invention in a top view

FIG. 3 shows the stacking and folding device according to FIG. 1 in this

compared to an enlarged illustration in side view, FIG. 3a shows the welding and separating device in a larger illustration

4 shows the stacking device according to FIG. 1 in a schematic representation in side view,
4a shows the stacking device according to FIG. 4 in an end view

Fig. 5 shows the stacking device according to Fig. 4a in another Working position

6 shows the stacking device according to FIG. 4 in a side view and

In Fig. 4, compared to the other working position, Fig. 6a, the stacking device according to Fig. b in an end view

7 shows a modified stacking device in a side view. FIG. 7a shows the stacking device according to FIG. 7 in an end view

8 shows the stacking device according to FIG. 7 in a different working position and in side view

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Fig. 8a the stacking device according to ^ ig. 8 in front view

According to FIGS. 1 and 2, the system is prepared for a double-lane mode of operation. It consists of the two unwinding stands 10 and 10a with the supply rolls 11 and 11a for the Foil webs 12 and 12a, which are fed to the processing machine as half-tubes via assigned folding triangles and 1 ^ a. 14 with a longitudinal welding device is referred to in order to close the half-tubes at the open longitudinal edges and thus one Form hose. Correspondingly, a longitudinal welding device 18 is assigned to each web 12 or 12a. Then arrive the fo] 3en webs in a side folding device to in insert gussets into the hoses. The two side folding devices are denoted by 15 and 16. Pig. 2 shows the reduction in the width of the hoses schematically the insertion of the gussets. Below the two side folding devices 15 and 16 are foil compensating vibrators 17 arranged to make the transition between continuous film motion to the side folding device and discontinuous operation in the manufacture of the bags by severing To be able to effect hose sections. The continuous film withdrawal is denoted by 18 and the main machine part is denoted by 19 the pile welding device. A photocell is designated by 20.

The two film webs 12 and 12a are welded

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device 21 separated into bags, whereby it is used for production in the particular bag shape explained in the form of the so-called "shirt bag" around a separating welding device with a heated wedge or around a double seam welder in such a way that in welded seams attached at a certain distance from one another between which a separating cut is made. It follows from this that the transverse edges at the beginning and at the The end of the bags to be stacked are provided with welding seams. According to the invention it is proposed to stack with Temporary jamming of the stack of bags in areas outside of the welds. This is achieved by the special design of the stacking and clamping device, which is shown in FIG. consists of the about a horizontal axis 22 opposite to the Dructc Stacking table 2.5 which can be lowered downwards from pedestal elements with the clamping strips 24 and the hold-down device 25, as can be seen in detail from FIG.

Fig. 3 shows the welding device 21 with the two feed rollers 26 and 27 and the insertion combs 28 and 29. The to be processed Hose is between the upper Sohweißbalken 30 and the lower welding bar 40, both welding bars have associated welding surfaces 3üa and 30b or 31a and 31b, between which the ' Separating knife 32 is arranged. So be Ernaltan double weld seams, between which a separation cut through the Knife 32 is made.

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To produce the bags, the tubular webs 12 and 12a are advanced by the feed rollers 2.6 and 27 by an amount which corresponds to the length of the bags to be produced. Then the rotation of the feed rollers 26 and 27 is interrupted and the ÖchweiidDalken J50 is lowered, which, in conjunction with the counter-welding Dalken , produces the double seam welding and the cutting knife makes the separating cut. As soon as the sealing bar 50 lifts off again, the hold-down 2 ^ goes down and, with this hold-down, the stripper 26 »

In Fig. 3, the hold-down device 25 and the stripper 26 are in full Line drawn in their rest position, drawn in dashed line in their working movement. The scraper 2β has the Task of pulling the rear area of the bag in the direction of movement out of the welding device and angling it downwards, as can be seen in FIG. J5 with the stacked bags

Design and operation, the stacking device be h- explained with reference to Fig. To 8.

The bags are on the aforementioned stacking table 23 and on 2J5 stacked in such a way that the in the direction of movement The front part of the respective bag is placed on the pull-off belt and the rear part is placed on the stacking table 2j5. Of the Stacking table 23 is about the aforementioned horizontal axis 22 after can be swiveled at the bottom, against the pressure of a screw

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linienfeder · and the same spring element 34, which deals with a The end is supported on the underside of the stacking table and the other end on a fixed support surface. From Fig. 4a is to see that on both sides of the Auflagtisch.es 23 stops 36 and 36 a are available, each of the support table 23 to a to a small extent. According to FIGS. 4 and 6, the attacks are fixedly arranged, you have next to the horizontally aligned clamping surfaces 37 and 37a in the direction of the bags or to the support table 23 inclined upper outer surfaces 38 and 38 a, so that each upper bag 40 through the retainer 39 with its going down on its two longitudinal side edges bent upwards and then the first upwards bent side edge areas with the downholder 39 going down under the clamping surfaces 37 and 37 & get «, in Fig. 5 is the intermediate position in dashed line of a bag 40 to illustrate the upward bending of its side edge regions. With going down of the hold-down device and its support on the first bag or the bag stack that has been formed in the meantime. will the support table 23, as shown in FIGS. 6 and 6a, downwards pivoted away so that between the respective upper bags and the stop or. Clamping surfaces 37 and 37 a a sufficient gap is formed, the upwardly resiliently angled side edge areas of the respective soldered bag can then assume the normal position and a 'plane with the rest of the bag surface form. With the subsequent upward movement of the hold-down 39 thus also the respective upper bag in its side areas between the storage table or the one already located on it

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Stack of bags and the stop bar or clamping strips 38 and 38 a clamped.

7 to 8 show the measure that the support table 23 is fixed is arranged. The stops 36 and 36a are related to this relatively displaceable in order to achieve the aforementioned clamping of the bags after they have been stacked. With or before going down of the hold-down 39, the stop strips 36 and 37 are raised via eccentrics 42 and 42a arranged on a shaft 41. As soon as the last bag has been placed on the other bags by the hold-down device and the hold-down device removes the stack of bags thus clamped on the support table 23, the stop bars 36 and 36a, which are at their lower areas are provided with port sets, by a helical spring 44, which is supported on a fixed surface 45, as the rotation continues, the eccentric moves downwards so that the stops now hold the bag stack against the support table effect and thus the hold-down is relieved and can go up again. There is thus a constant interplay between the hold-down device and the stop bars, with a constant supply of new bags to be stacked, until a sufficient one Stack is present. Once a stack in sufficient Number of bags is available, the stop bars are raised. Then the conveyor belt 33 according to FIG. 4 and according to FIG set in motion so that the stack of bags can be transported further. The fixed support table can also be the conveyor belt 35, in conjunction with the liftable and lowerable

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Stop bars 36 and 36a. However, it is also possible that the Conveyor belt or the belt take-off 33 as a support for the items to be stacked Bag against the pressure of spring elements by the hold-down device 39 down with stationary stop bars 36 and 36 a is pivotable, and thus the special one in Figs. 1, 3 and 4 support table shown can be omitted, It is also understandable that the stop bars do not need to have the spatial shape shown in the drawing. You need these stop bars also not to be moved up and down in the vertical plane, provided they are movably arranged. Stop bars in Form of flap-like structures that swivel around axes that are to the side and running parallel to the longitudinal edges of the bags

1 and 3 show the further measure that the first Tape take-off 33 is followed by a further tape take-off 46. The first trigger 33 runs in the specified direction of rotation 47 as soon as it is actuated in sets «, It has a drive shaft 48 which is driven by a chain or a toothed belt 49 which in turn receives a drive from a roller 50 derived from an electric motor 5I Toothed belt drive 52 is driven. From the deflecting roller 48 the tape arrives at a deflecting roller 53, from there to the deflecting roller 54 in the immediate area or adjacent to the stacking table 23. From there it is guided over the deflection roller 55 and the deflection roller 56 located vertically below it, from which it is directed to the the first-mentioned drive roller 48 is guided.

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There is another belt take-off 46 with the drive roller 57, which is driven by a toothed belt q. like 58, Starting from the belt pulley 50, which also drives the belt take-off 33 “The conveyor belt 46 is redirected further through the Rollers 59> 6O and 61 so that it is essentially rectangular or square path is performed.

After a stack of a sufficient amount of bags has been formed, after the clamping device 36 has been released, the The stack is initially transported by the conveyor belt 33 in the indicated arrow direction 47a. With this transport In the indicated arrow direction 47a, the conveyor belt 46 also runs in the indicated arrow direction 47b, so that it runs in the direction of movement front end of the bag staple, as can be seen from Fig. 3, is brought under a punch 62 which, according to the exemplary embodiment, consists of a U-shaped knife. This B Knife is moved via a toggle lever 63,64 in connection with a piston rod 65 of a hydraulic or pneumatic Piston-cylinder drive 66. A shearbar 67 is provided below the upper run of the belt 46.

Within the almost rectangular or square path Belt take-off 46 is a conveyor belt 68 which runs transversely to the tape take-off 46 and has the deflection roller 69. The punched out Parts of the stack of bags fall from the punch onto the conveyor belt 68 and are transported away by the latter. after the The punching is done, the punching is done with the stationary

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Tape draw-offs 53 and 46, the tape take-off ~ ^> is set in motion again in the indicated arrow direction 47, and the tape take-off 46 is set in motion in a direction of movement 47c, that is, in opposite directions. This is done by a reversing gear on the drive shaft 57. The reversing gear is not specifically shown in the drawing because it is understandable anyway and can have different designs.

Simultaneously with the movement of the tape pulls 55 and 46, advantageous a little earlier, a folding sword 70 is moved downward in the indicated arrow direction 71. This folding sword 70 folds the bag stack approximately in its middle around an axis transverse to the longitudinal direction and pushes the bag stack between the two running approximately parallel and perpendicular to each other end strands of the tape take-offs 55 and 46, so that the folded stacks of bags is transported downward by the belt pull-offs 55 and 46. In the lower area takes over the tape take-off 53 with its circumferential section 55 & the transport to a further conveyor 72, which is in the direction of the arrow 75 is moved and is guided around the deflection roller 74 for this purpose. At 75 there is still a transfer plate or transfer grate from the Belt take-off 55 to conveyor 72 indicated.

It should be understood that the tape deductions 55 and 4b, if one Punch 62 is used, does not consist of one wide band, but of several narrow ones, spaced apart from one another located ribbons or from cords. To the transition of the folded, transported by the tape drawers 33 and 46

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To facilitate the stack of bags from the vertical direction obliquely downwards in the direction of the conveyor 72 is advantageous there is also a diversion grate 74 made of lattice bars.

It should be understood that the solution according to the invention without the arrangement of a punch 62 is possible because it describes a method and an apparatus with which a plurality transported by stacks of bags in various bag shapes and can be folded and transported further as a folded stack

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Claims (12)

PATENT CLAIMS 1. Method for stacking and removing bags, especially as carrier bags, made of thermoplastic plastic film, characterized in that the bags are continuous stacked on top of each other, then the stack of bags underneath a folding device is moved and the folded stacks of bags are transported away by a transport device « 2. Device for performing the method according to claim 1 * characterized in that the stacking device consists of a support (23, 33) for the stacked bags exists, which interacts with a clamping device (36) * which grips the bags or the bag stack in the area of the longitudinal edges, for relative displacement between the support (23 ^ 33) and clamping device spring elements (34) are arranged, more » a hold-down device acted on the bags 3 ο device according to claim 2Γ, "characterized in that the support table is resiliently mounted and on both fcängskanten of the support table this by one A small amount of overlapping stops (37) are present and the bag stack is clamped between the support table and the stops took place 509819/0198 • tr 4. Apparatus according to claim 5, characterized in that that the support table (23,5j5) against the Pressure of spring elements (34) around a horizontal axis (22) is tiltable. · 5. Apparatus according to claim 2, characterized in that the support table is arranged in a stationary manner and the stop strips (%) can be pressed against the stack of bags by the pressure of spring elements (44) and can be raised against the pressure of these spring elements (44), 6 »Device according to claim 2, characterized in that, in the direction of movement, the bag to be stacked is arranged in front of the bodice holder (25, 59) ^{and a} stripper (26) moved parallel to it. 7. Apparatus according to claim 2, characterized in that that in the immediate connection to the support table (23) a tape take-off (33) is arranged and at The bags stack the bags with their front part in the direction of movement on the tape take-off (33) + rear part on the Lay the stacking table (2 ^) on. 8. Apparatus for performing the method according to claim for transporting and folding the stack of bags, characterized by two spaced apart one behind the other 509819/0196 - 1 - Tape take-offs (33 * 46) > whereby the first tape take-off (33) © in the transport direction has a constant direction of rotation, the tape take-off (46) behind it can be switched to a return, a folding sword that can be moved in the area between the two tape take-offs is arranged « 9. Apparatus according to claim 8, characterized in that, marked e i c hne t that the first tape take-off (23) and the downstream second tape take-off (46) in their adjoining one another Area have parallel or substantially parallel and vertically directed conveyors. 10. The device according to claim 9 *, characterized in that that the first tape take-off (23) has such a guide that he the folded bag stacks on a another conveyor belt (72) transferred. 11. The device according to claim 8, characterized in that that in the area of the upper run of the second tape take-off. (46) one acting on the bag stack Punch (62) is present. 12. The device according to claim 11, characterized in that that in an area below the punch (62) and within the movement-adjustable tape take-off (46) 5 0 9 8 19/0196 a conveyor belt (68) running transversely to this is provided for the punched-out parts of the bag stack. 509819/0196 Blank page